Hanna Instruments HI 96104 - Manual (Page 11)

11
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
Cooling lamp: The instrument waits for the lamp to cool down.
Battery low: The battery must be replaced soon.
Dead battery: This indicates that the battery is dead and must
be replaced. Once this indication is displayed, normal operation
of the instrument will be interrupted. Change the battery and
restart the meter.
The instructions listed below should be carefully followed during testing to ensure best accuracy.
• Color or suspended matter in large amounts may cause
interference, therefore these should be removed by
treatment with active carbon and by prior filtration.
• For a correct filling of the cuvette: the liquid in the
cuvette forms a concavity on the top; the bottom of this
concavity must be at the same level of the 10 mL mark.
• Proper use of the powder reagent packet:
(a) use scissors to open the powder packet;
(b) push the edges of the packet to form a spout;
(c) pour out the content of the packet.
• Proper use of dropper:
(a) to get good reproducible results, tap the dropper on the table for several times and wipe
the outside of the dropper with a cloth.
(b) always keep the dropper bottle in a vertical position while dosing the reagent.